sustainable production of fuels and chemicals

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Section 5 Sustainable N2 reduction Anders Nilsson (Stockholm University) Ifan Stephens (Imperial College London) 5.1 Importance of subject Currently, ammonia synthesis is based on the Haber-Bosch process N2 + 3H2 → 2NH3. By pro- viding nitrogenous fertilizers for agriculture, its invention resolved what was the most important challenge at the turn of the 20th century: the prevention of mass starvation [1]. Despite the hugely positive impact of the Haber-Bosch process, it also comes with significant disadvantages in its current implementation. Industrially, the reaction is run with pressures above 150 bar and temper- atures above 400 ◦C, thus requiring large, centralized infrastructure. Moreover, the excessive use of nitrogenous compounds saturates soils and leads to substantial run-off into rivers and aquifers, leading to eutrophication and low water quality. Most importantly in the context of sustainable fuel and chemical production, the Haber-Bosch process consumes a colossal >1% of the global fossil fuel production [2], due to its use of methane derived H2 as a feedstock. For the 21st century, we need a more sustainable solution [3]. Ideally, a sustainable N2 reduction process would take place at low pressures and temper- atures, allowing for ammonia to be produced locally at the point-of-consumption. The reaction would rely exclusively on renewable electricity and feedstocks, eliminating the need for fossil fuels. Besides its importance as a fertilizer, sustainably produced ammonia is also a highly attrac- tive energy vector thanks to mature technology that allows it to be stored safely and reversibly at high density in benign, low-cost metal halide salts [4]. In this Section, we will explore two distinct routes to sustainable nitrogen reduction: • Modify the conventional Haber-Bosch process to operate at milder conditions (pressures of 20 to 40 bar) using a sustainably produced hydrogen feedstock from water electrolysis (see Section 1) 49

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